By doing so, it prevents the growth of microbes. This process was discovered by Louis Pasteur. It is called pasteurisation. Storage and Packing These days dry fruits and even vegetables are sold in sealed air tight packets to prevent the attack of microbes. 2.6 Nitrogen Fixation You have learnt about the bacterium Rhizobium in Classes VI and VII.
Louis Pasteur by careful experimentation demonstrated that life comes only from pre-existing life. He showed that in pre-sterilised flasks, life did not come from killed yeast while in another flask open to air, new living organisms arose from ‘killed yeast’. Spontaneous generation theory was dismissed once and for all.
Such (+) and (–) isomers of a compound are called optical isomers and the phenomenon is termed as optical isomerism. (ii) Molecular asymmetry, chirality and enantiomers: The observation of Louis Pasteur (1848) that crystals of certain compounds exist in the form of mirror images laid the foundation of modern stereochemistry.
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